Sandhill Electronic Caliper = HP71B + 82162A + Fowler Ultra-Cal II

[Ren]

Yes, I am going Off Topic here, because "Electronic Caliper" is in the title:

Last summer, I bought a Mitutoyo 551-227-50 (1 meter) electronic caliper at a garage/yard/tag sale for $25.
I figured, if it didn't work, it would still look awesome hanging on the wall (in the workshop - I have a wife!)
Surprise! It didn't work! The battery and compartment were green corroded.
Cleaning the compartment and replacing the battery resulted in a display that reads "E--o5".
Mitutoyo no longer makes this model and the display module is no longer available.

(So, I guess I may have to go the "object d' art" route.)

But, I'm wondering... IF the display could be "repaired" with a Raspberry Pi Zero transplant/mashup.

Does anyone here know how these things read the distance?

Thanks

(Moderator: I will not be offended if this gets moved to a different part of the fora.)